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Identification of material model for Finite Element Modelling of quenching process DOI:10.15199/24.2017.4.3

  The paper concerns modelling of quenching process using the finite element method. The special emphasis is put on finding the proper material characteristics, in particular for heat transfer coefficient on solid-fluid contact boundary and heat conduction for fluid, in case of highly complex flow close to the solid-fluid boundary. Only heat transfer and fluid flow are considered with solid phase mechanical behaviour neglected. The paper presents an approximate numerical model of the process and technical means by which its implementation is realised. The included numerical examples show how the obtained model allows for fast approximate simulations of quenching.Introduction. Quenching of metals is difficult to model numerically due to the complex character of processes involved, that include multi-phase flows and heat exchange between different phases [2]. Accurate models that try to capture the physics of all these processes are difficult to apply in industrial practice due to excessive requirements of computational resources, related to the necessity of resolving different time scales (e.g. for turbulent flow just after submerging a metal in a cooling agent - with time steps in the range of milliseconds - and heat transfer in the later stages of the process - with time steps in the range of seconds), as well as space scales (thin boundary layers close to the solid-fluid contact surfaces and large dimensions of quenched objects and the machinery used for quenching). The difficulty is additionally augmented by the complex character of computational domains in typical engineering problems. Therefore significant simplifications and the use of experimentally obtained data is necessary in order to provide algorithms that perform simulations with demanded accuracy in a reasonable time. In the paper we propose a finite element model for quenching simulations. In the next section the mathematical model used in finite element simulati[...]

Hybrydowy system wspomagania projektowania technologii produkcji taśm szerokich walcowanych na gorąco w arcelormittal

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Celem pracy było zaprojektowanie oraz implementacja złożonego systemu komputerowego wspomagającego projektowanie technologii walcowania taśm szerokich w ArcelorMittal dedykowanego dla nowej Walcowni Gorącej w Krakowie. Stworzony system ma charakter oprogramowania hybrydowego, gdyż łączy w sobie funkcjonalność wielu technik numerycznych, takich jak Metoda Elementów Skończonych (MES), optymalizacja metodą Rosenbrocka, bazy danych czy też bazy wiedzy wraz z systemem eksperckim. W niniejszym artykule przedstawiono projekt programu, a także istotne szczegóły implementacyjne z wybranymi modelami materiałowymi. Zaprezentowano również przykłady rezultatów uzyskanych przy pomocy opracowanego systemu. The main objective of the work was focused on creation of sophisticated computer system suppo[...]

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